dreamliners were grounded around the world last week after problems with their batterers. >>> and at president obama's inauguration today security will be extremely tight. 42 different agencies will be working together, not only watching for threats and emergencies but also monitoring traffic accidents and water main breaks. john miller reports. >> during president obama's first inauguration there was a threat taken so seriously that counterterrorist agents seemed to be everywhere in the area. people were taken into custody and taken lie detector tests. in the end the tip turned out to be young but the young administration on its very first day, a picture of what can go on behind the scenes of major event. for this inauguration some of the security is meant to be obvious. the coast guard will shut down the potomac river, but some of the security is meant to be nearly invisible. at union station, two men who could have been waiting for a train were actually dhs behavioral detection officers who blend in with the crowd, training to look for suspicious behaviorer among passengers, they